Vania



@einen fatta gatimt @fitta ROBERT E. ROGERS AND JAMES BLACK, OF PHlLADELPHIA. PENNSYL- VANIA.

Letters Patent No. 70,746, dated November 12, `1867.

IMPROVEMENT IN STEAM-GENERATORS.

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Be it known that we, ROBERT E. Results and JAMES BLACK, both of the ety of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Steam-Boilers; and we do herebyA declare that the following is a full and exact description of the construction and operation of the same, reference being had to the annexed drawings, forming part hereof.

The improvements herein described are modifications of the steam-boiler for which Letters'Patent were granted to us January 19, 1864, and reissued December 19, 1865. In the drawings- Figure l s a front View ot" the boiler, with the enlargement at its upper end, showing also the tubes for the circulation of the water, (the ease D being cut away showing also the steamdrum.

Figure 2 is a plan of the base of the enlargement, showing apertures for the insertion ofthe upper extremities of the circulating tubes.

Figure 3 is a vertical section of a modification of our boiler. In this instance there is an enlargement at I each end, and the circulating tubes extend straight from one enlargement to the other.

To enable others skilled in the art to make and use our invention, we will proceed to describe its construction and mode of operation. n

In fig. 1, A is the body of the boiler, having an enlargement, a, of its upper portion. This enlargement projects beyond and at or about a right angle with the body of the boiler A, forming a shoulder in'to which the upper ends of tubes B, for the circulation of the water, are inserted. These tubes are connected at their lower ends directly with the body of the boiler, and at their upper ends directly to the enlargement or shoulder a, as

shown inthe drawings, in which it is shown that the lower ends of the tubes B are bent, while the upper extremities are inserted straight into th'e enlargement or shoulder a.

C (tig. l) is the steam-drum. It is connected with the enlargement a by pipes, as shown, having the object to increase steam-room should the steam-space S of the enlargement a be deemed insufficient. The use of this drum is optional. l

D is the surrounding case, which contains the boiler, and forms the fire-chamber; It is evident that this may be constructed of iron, masonry, or any suitable material, and that they products of combustion may be led oit` vertically past the enlargement a, between it and the case, or by means of iines passing directly throughl the enlargement a.

The parts marked E represent re-grates. The line e, iig. 1, indicates the height of the water, and S the steam-space in the boiler.

By making the enlargement a, and connecting therewith the circulating tubes B, as shown, one of' the bends of said tubes is avoided, thereby facilitating constructionl and repairs of the boiler, and, at the same time, rendering the circulation of' the water through the tubes more easy, and giving increased steam-space. Y Having thus described our invention, we claim, and desire to secure by Letters Patent-` The boiler A, having the enlargement a formed s o as to project at or about a right angle with'theibody of the boiler, in combination with the circulating tubes B, when the upper ends of said tubes are inserted straight into the enlargement a, and the lower ends of said tubes are bent and inserted into the lower portion of the body of the boiler A, substantially as set forth.

^ R. E` ROGERS,

JAMES BLACK.

- Witnesses:

Gao. E. BUeKLnY, FRANKLIN SMALL. 

